Combined telephone and alarm or kindred service system.



W. W. DEAN. COMBINED TELEPHONE AND ALARM 0R KINDRED SERVICE SYSTEM.

APPLICATION FILED APR. 30, 1903.

Patented Dec. 13, 1910.

2 SHEBTS BHEET 1.

. W. W. DEAN. COMBINED TELEPHONE AND ALARM OR KINDRED SERVICE SYSTEM. APPLICATION FILED APR.30, 100s.

QZffifig Patented Dec. 13, 1910.

2 'SHEETSSHBET 2.

PATENT onnron.

. I 1 I I WILLIAM DEAN; OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO CONSOLIDATED EIRE COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

COMBINED TEL PHONE Ann ALAni/i on xrnn'nnn SERVICE SYSTE L Specification of Letters Patent. p t t q 13, 910.

Application filed April 3 "1903. Serial No. 154,956.

v' l 'd all whom it may concern:

State of. Illinois, have invcn'teda certain new and useful Improvement-1n Combined Telephone and Alarm or Kindred Service Systems, of which the following isa specification,

My invention'relates to improvements in I combined telephone exchange and alarr'n or kindred service systems,"arid hasfor=1ts( b-- jects, generally speaking, the'provision of means \\'h'ereby an alarm orfkl'ndredservice system may be conveniently engrafted upon a modern telephone exchan e system with-; out hindrance to thevlatter inithelpei'forih-z an'cc-of its accustomed functions. The successful carrying 'out of such a result is of importance since itgives an added earning capacity to the telephone plant without any or at least only a slight increased expense for the auxiliary instruments. -Th1s auxlliary use of the telephone lines'and apparatus forms one of the most important by-prodnets. of the telephone business. I

In my invention, I provide a magnet in each side of the metallic telephone lines, an alarm receiving apparatus torespond to the incoming alarm or kindred signal, and

means controlled by said magnets to pre-' vent the operation of the saidazppahitus when normal telephonic currents are present on the-lines; In some cases this receiver may be merely an individualsignal, a register, or both, and in any event is such as the particular type of auxiliary :service demands. I also provide an eiiicient 'form of trouble test for the alarm system whereby trouble on any of the lines will be mani tested by suitable signals and may be at once I isolated from the remainder of the system to not disturb the same and is then attended to in due course. The use of the common central source of current for both telephonic purposes and alarm signal purposes is also of value since aseparate power plant;

avoided; In one form of my invention I also make use of the line relay of the telephone line for one of the alarm signa l controlling magnets. l

Other features and advantages of my invent on Wlll appear from the detailed de- SCIlPtlOIftllld the claims reference being had to the accompanying drawings in which the same reference characters designate -like parts throughoutth'e several views and in which 1 I Figure 1 is a diagram showing one form of my invention; Fig. 2 is a view showing I a slightly different arrangement; Fig 3 is a modification of the device of Fig. 2, and Fig. 4 is adiagra-m ofa further modification. e

Referring to F ig, 1, "L; L and L designate subscribers telephone lines extending "in tw'o lim'bs 2 and '3 from their respective substations A, A and A to the central qflicc. 7 At the substations any usual or desired ,telephone apparatus maybe employed, but preferably su'ch'a's is adapted for use in conlncc tion with a central common source of four-i rent. The apparatus shown eomprisesi a' transmitter 4 and a receiver 5 in a bridge'otj the line conductors whose normal disconF-1;.75 tinuity is maintained by the hook-switchfi, while a call-bell 7 anda condenser 8 are included in a permanen'tbridge. Atthe eentral ofiice the lines are as usual provided nith an answering jack J and with a 'plurality of multiple jacks J and J, each of which is" provided with tip and sleeve {contacts j and 7' connected respectively with the corresponding line conductors and with a third contact 7' the latter contacts ofleach line being connected together by a third couduetor 9 which includes the winding of the cutoff relay R of the telephone line. The line conductors 2 and 3 are normally completed through the contacts of said cut-ofi' relay R; the tip conductor being grounded, while the sleeve conductor includes the winding of the line relay R which is thence conneeted by connnon lead or conductor 10 with the livepole of the central battery B. The said linelrelay controls the individual line signal S of the telephone line, which is preferably in the form of a small incandescent lamp.

T he operators outfit comprises a plurality of cord circuits of the type shown in the drawing, each of which is provided with an answering plug P and a calling plug P each plug having tip and sleeve and ring 1 'contacts to cooperate respectively with the'l05 corresponding contacts in the spring jacks of the lines. The tip contacts of the two plugs are joined by flexible strands Z and t which include the windings w and 'w of a 3 being included in a conductor 23 common to repeating coil, the middle point of which is connected'to the grounded pole 'otfthe but f tery B while the sleeve conductors of the 5 plngs'are joined by the similar strains i and s which likewise include windings 'w and 20 of a repeating coil and which are joinedrto the live pole of thebattery. These r ter strands include respectively the windings of the supervisory relays rand P which eontrol, normally open shunts of the super- "vi sorylamps S and S associated with the 3 answering and calling plugs and included in the third-strands 11 and 12 of the two plugs leading from the ring contacts of said plugs tto the live pole of the said battery B. The

"operators receiver 13,-the secondary of her nduction coil-14 and a condenser 15 are hdapted to be bridged across the answering ,end of the cord circuit by means of any ,l-suita'ble or usual listening key, while her Fitransmitter 16 and the primary of her in- 3" duction coil are charged from any suitable 5 source of current and which may be the batter, -B. A ringingjgenerator 17 is adapted l to e connected with the calling end of'the cord circuit by means ofany suitable ring-Q ing' -keyfrand representedfby the springs The apparatus sofar" described comprises one" comm'qn form of telephone exchange c systein and operation is well understood. Inkorder to adaptsucli lines {or-fire alarm anddr'i'ndred servic'e the subscribers stations orswother; outlying station must be provided witlrm *transrhittmgdevice which may be of a-ithetype iiIf0mHiOIl use for messenger call, fire-alarm or other service that is capable of sendin preferably distinctive si nals to 4o .the centra l-bfiice. At the central 0 ce auxiliaryreoeivingapparatus must be rovided sZQ'ieSpond to such distinctive signalling current8-;tb'i'eceive and record the said call so that-the same may be suitably attended to,

i and this without serious interruption of the telephone service. E designates conventionally sucli'a transmitter of usual type, the rotating member or pin wheel 19 of which is provided "with a grounded brush or 'spring.

20, while" the teeth of said member are arranged when it is rotated to engage spring 21 and intermittently connect it with ground through brush 20 and also lift it into enga ement with the upper spring 22 which is ,li ewise grounded; These springs are respectively connected with the line conductors 2 and. 3. At the. central ofiice a. pair of magnets'r and 1*" are interposed in the tip andsleeve line conductors-and are suitably shunted --by-non-inductiveresistances to permit the ready passage of the voice currents. The tip relay 1" is iprovided with normally. closed contacts one of whiehis grounded and the sleeve relay 1 with nor- 55 mally open contacts, bothsets oft-contacts all or a desired number of lines of the ex change and including the winding of the register magnet it from whence it leads to' the live pole of battery B. When the mag- 5 net 1-" in any of the telephone lines is energized, it is apparent that. a path for current is completed from the battery B over conductor 23, through'the register magnet R, and thence through the contacts of both relays 1" and r to ground; but when both magnets r and r are deenergized or both energized-and these are their conditions of use when the line is used for telephonic purposes it is likewise apparent that the said path for current over conductor 23 is disrupted so that the register R is not ac-' tuated.

The register R may be of any suitable type and ispreferal'ily provided'witli a tape 24 upon which theunessage is recorded by r the point or pencil 25 actuated by the magnet of the register R and which likewise controls the circuit of an audible -or other signal 26. The register is, "of 'course,'prop is desired to actuate the alann'signalnt thef'j:

central ofli'ce the'wheel ,E is set' inbperation in the usual manner and serves to mummietently connect springs 21 and to round Magnet T will not now;be actuate since the line conductor 2 is groundedjatthe-ceutral ofiice and since the line conductor is thus short cireuited through the earth'no current will flow thereover. Magnet 1-,- however, is actuated since the line conductor 3 is connected with the live pole of the main battery B at the central office. Relay magnet 1- serves, therefore, to close the path for current over conductor 23, through the magnet of the register R and from the battery .B. This register is, therefore, actuated ac cording to the impulse sent over the line and since each device E sends a distinctive signal, the record :on the tape shows which sta tion is sending in the alarm. The line sighal may be flashed at this time but the'operators at the exchange are instructed to disregard such intermittent action of the signal. The particular object in grounding both sides of the line at the substation at the time of sending in the call is to guard against disarranging the alarm system by the transposition of the line "conductors 129- when installing or repairing the telephone system. It is also apparent that the normal operation of the exchange for telephonic purposes will not actuate the alarm register for the reason that at all times during the connection both relays are energized orbot-h v arcfdeiinergizcd so that the conductor 23 cannot be closed. For-example, if the subscriber A. desires a connection with the central oltice, he removes hisreceiver and there- 13o by closes a circuit from battery B over conductor 10, through line relay R thence,

over sleeve conductor 3, through the substaserving which the operator inserts the answering plug P of her cord circuit thereby completing a path for current over the third strand 11 of said circuit and conductor 9,

through the cut-off rehr R of the line. The actuation of the cut-o rela serves to render the line signal inert an to'connect the battery B in the metallic circuit-of the tele- 15 phone line. .Then connecting her instrumentwitli-the-cord cir'cuit'the operator re-' ceives the order-for the connection and comtouching the tip f'the' calling contact with one of sai pletes the same with the calling plng' P.

be supervisory relay 1' is now operated to shuntthe supervisory lamp S so that the lflltter'remains dark. The idle or busy condition' of the wanted line is'determ ned by I lug P 'to the test ring j of the multiple ack of the wanted line before her. Ifthe line is idlethe l'test jrin'gs- .ar'e {groi'indedland inasmuch as the tip' of'gthe testing fplii is likewise grounded no flow of current results and no click is received, If, however, the line is busy the saidtest 'ringsare connected over thetllird strand' 'df the inserted cord with the live pole o'fth battery B'so that when" the-tip of the testing rings, a flow of current. results through the repeating coil winding wQ and inductively aclick in the opratdf ii" Assil'niiii'g 'itlilit the line is found idle said plug P is inserted and the ringing generator 17 operated. The insertron of this plug operates the cut-off relay 'R of the called line in .the manner specified with reference to the calling line, but before ;the'. subscriber respoirds and aft'er'he has 'been called supervisory-relay '1" isunactuated that the supervisory lamp S is lighted. The response of the called subscriber energizes the relay r and shunts the lamp S -to extinguish it. During conversation the battery B is feeding current out over the two connected telephone lines and should it beixnne'ncoessary on said lines to send in a call by means of the transmitting device IE. it is apparent that, the same operation of the relays-1" and 1",'\vill"resnlt ashefore described, for the reason that the live pole of the battery is still connected with the sleeve side of the line and that current will be cut-oil from the tip side of the line by the ground at the substation. thereby encrgizing relay 7" and dci ncrgiziug rela' v T which is the necessary condition for the operation of the call register. lhis would interrupt conversation, but as the duration of the alarm signal is short and its occurrence ainlikely and since if sent it is apt to be of (plug is brought into more importance than the telephonic con versation, such arrangement is dccmcd pr-z-t'crable.

electrical lock for theregister controlled by the two' magnets in the line. while Fig. 2-

illiisti'ates a mechanical lock for'l'hc dcvicc controlled by the same magnets.

v Fig. 3 illustrates the use of the mechanical lock of Fig.2 in which the individual register is dispensed with and the armature of. magnet 1" employed to control the circuit ofconductor leading to the common register as in Fig. 1. Magnet r serves when ienergiie d to close the said conductor, while themoitu'zrtionnfrelay r" or simultaneous energization of both relays locks the couductor'23 open. l'nboth Figs. 2 and 3, the time-constant of the locking magnet v is less than that'of rfthis being accomplished 'in any usual or desired manner.

A Fig.- 4 designates asimilaralarm apparatus but with a different type of line circuit. and one in which-the spccial line relay is dispensed with and the fiinctions thereof accomplished by means of om of the fire alarm magnets; In this'type of line the jacks J, J" and J are provided with only tip and sleeve contacts which are connected with the front. contacts of the springs of the cut-ofi relay R, the winding of the latter being connected to ground from the slccvc side of the jack section of the line. The tip conductor 2 of the line is normally groundcdand also normally completes at one point the local circuit of the line signal while the conductor 3 is normally connected with "the conductor 10 leading to the live pole of .the battery B. The relay r is provided with normally open contacts. one of which is conncctcd wit-h the said conductor 1 leading'tothe live pole of the'battcr v. and the other of'which is joined by conductor 30 \illhfllfi movable Contact of relay 7, the latter being normally in contact with the conductor 23 leading to the con'nnoir regisfor R which is grounded at its other tor-.-

minal. The forward contact of said movable mcmhcr of relay 7* is inthc local -circuit of the line signal \Vhcn the subscriber calls for a connection-at the central oflice. he completes a patlrfor current from battery B over the two sides of the (elephonc line and both relays and a are actuated with the result that the local circui't of the signal S is completed. Themsimilarly united through the strands s and s and the condenser c. Supervisory lays 1'? and 1' are connected'together with the battery B between the strands t and s, i said relays suitably controlling through their contacts the circuit of the supervisory signal S, Similarly relays. 1" and '1'? together with the second battery B are connected across the calling end of the cord clr- .cuit and control thesupervisory lamp 8.

The operatcrs receiver 13together with her other apparatus may beconnected between the strands of the calling end of the cord:

circuit by the o eration oi any suitable lis- ;.tening key, whi e a calling generator 17 is suitably,connectedwith the calling plug P by the operation of the springs 18,, 18 of the usual ringing key. The insertion of the answering plug also energizes the supervisory relay Wfto close the local circuit of supervisory lamp Stb u t-ow ing-to the fact,

that the subscribers receiver is in use, the cooperating supervisory relay '1 is actuated and said lam p ,is prevented from operation. The wanted line is tested by touching the tip of the calling plug to one of the test rings of the line wanted. It idle said lines are grounded and since the tip of the plug is likewise grounded no flow of current results, but if the line is busy the sleeve con- -tacts are connected through the sleeve contact of the inserted plug with the live pole of one of the batteries B or B so that when the grounded tip of the testing plug is brought into contact with one of said rings, a flow of current takes place and the operator receives a busy click. If the line is found idle, the calling plug P is inserted and the ringing key 18, 18 operated. The

sleeve spring of said key when depressed permits current from the battery B to flow through the cut-off relay of the line during ringing to maintain the same actuated. Supervisory relay 2- is actuated after the subscriber has been called but before his response to close the local circuit of supervisory signal S which is accordingly lightcd, but upon the response of the called subscriber the cooperating tip supervisory relay is actuated to render the said signal in crt. During conversation the batteries B and I? are sending current out over the 1 telephone lines for the operation of the subscribers transmittcrsand the variims relays associated with the cord and line circuits. Should an alarm signal be sent in during'a connection it will be duly re ceii edfor the tip relay 7" would be deenergiaed while sleeve relay 1* would alone be energized and the register R would therefore be actuated. I have shown in this figure the individual signal lamps S associated with the alarm circuits. These lamps are responsive to the alarm signaling currents fronr their own particular lines. In case of a ground upon one of the lines which would cause current to flow over the line conductor 3 'fromthe battery B or B the said lam "S will be lighted and the attention of t e attendant or operator will be at once attracted to the particular line. The continued operation of the common alarm 26 would also indicate that there was trouble on the line. In order to test for the trouble and. to correct the. sameylv provide in each one of. the individual branches of the alarm circuita suitable jack 3 into which a metallic plug P is normally inserted and by which both con- "tacts of the jack are electrically connected and the signal circuit thereby maintained intact. In order to test for trouble onthe. lines in connection with the' alarm service I provide a testing plug R to the tip contact of which a conductor 31 is connected which leads to a test relay 1"", the opposite terminal of .w-hicl1-.-is'co1mec t .ed through a suitable battery"32 to ground. The forward contact of said relay is connected by a conductor with one of the contacts 33 of a switch 34, while-the back contact is-joined through another conductor to another contact 35 of said switch. The switch lever 34: is joined by a conductor 36 to the alarm 37; the other terminal of which is grounded. In case one of the lines is grounded and the signal" S ion isdisplayed, the metallic plug I is removed and the plug P is inserted. This disconnects the line from the register and connects the conductor 31 with the tip spring of the jack J" and by placing the switch lever 34 upon contact 33 it is definitely ascertained that a ground is present on the line by the continued ringing of v the bell 37. Now placing the switch lever 34 upon contact 35 and pernxitting'the plug P to remain in the jack J the said bell will again ring when the trouble isremoved -from the line and the armature of therelay drops back to'its normal contact. -attendant that the trouble has been remedied when the plug P is removed and the metallic plug P again inserted. The signaling circuit is thus restored to normal position, the trouble having *been removed without. aii'ccting the reinainder of -the alarm service system.

This will indicate to the f no current is present-on 'CGIVIDg meansalso remains 'unoperated for 'it requires. the excitation of'inagnetji "to,

It will be understood that-the visual Lions may be operated in any desired manner either manually or by autoinaticmeans as incase of fire, burglary, etc. I have notshown this feature because it is well understood by those skilled in the artand would have to be modified to 111061; the requirements of each particular case. As is well understood this device may he placed at any outlying point on the line.

The invention is applicable to line circuits of various types and to systems of different arrangements.

As pointed out in allthe figures, the normal operation of the telephone line 'for tele-- phonic purposes causes the operation of magnet-r which serves to prevent the operat-ioiiof the signal receivin" means. When the line such reaccoinplish that result.

signals and the alarm testing feature of Fig. 4. may be applied to the systems of the otherv figures-or. any other system for the same purpose but for the 'sakeQof simplification nis not shown. The "battery 32 having the same e-battery B or B 9- pole grounded'inav'obviously be either 1 claim: i I

1." In a telephone exchange, .the-combina-' tion, with -.a ,telephone line le'ading' fronr a subscribers station I to a central statio'n; of a telephone seta't the-{substationand tele-. phonic apparatus at the said a central station including a line signal, a source of current and an 0 ei'ators connective outfit, to co';

' operate with said line and stibronversational purposes talarm signal transmitting apparatus at anf outlying fpoint adapted to transmit distinctive signal ng currents over the telephonelin and alar n'signal receiving apparatus at the central station includang ani'elect'ro-ma netiii each side of the 45 line in the path 0 current therein, said receiving apparatus-being responsive to said distirrctive: signaling "curren ts'i through one of said inagn'ets only but unresponsive to the telephone signaling and talking currents fioiving from'saidsourcethrough both magsubstantiallyasdcscribcd; Ii a telephone exchange, the 'conibinah t telephone line leading ,t'roin la sulg'scriberh station to a ('ie it ral station, of a phone at the substation and' telepl" nc-apparatus atthc said central station i ivithjsaid l neand set for conveisational; purpo alar 'u signal tri 1ns|nittin qpparatusat I ptiint-adaptcd transmit; dist nctive sigi-lahng currents over'thetclephone'liiie, andlalarui signal receiving apparatu'scat .the cei 1t 'al' stat on H1: eluding aneleetro-niagnet in each side of the line, one of said magnets serving when i the other serving when energized to prevent t the operation of said receiver, substantially i as described. 1 z

I In a tele hone exchange, theconihination with a telephone line leading from a 'subscribefs statiouto a central station, of a telephone set at the snbstationand telephonic apparatus at the said central station to coiiperate'with saidline and set for conversational purposes, alarm signal transmitting apparatus at an outlying point adapted to transmit distinctive signalingcurrents over the telephone line, alarinsignal receiving apparatus at the central station having a .niagnet in each side of the line, and means whereby when any one of said magnets is energized alone bysaid signaling currents magnets; are deenergized or are both ener gized as by the telephone currents said, receiv'er is prevented from ,opgratioi substa itially as'described;

j 4. In a telephone exchange, the combina-. tion with a telephone line leading ,from a subscribers station .to a central station, of a telephone set 'at the'substationand tele- 'to cooperate with said line .for 'coiiversafl tional purposes, alarm signal transmitting apparatus at an outlying point adapted'to transmit distinctive signaling currents over' the telephone line, alarm signal'receiving; apparatus at the central station including a magnet in each side of theline and an operating circuit, one of said magnets s erving when operated by the ,said signaling currents to close said operating circuit to actuate the said receivingapparatus, and the other magnet serving when actuated-by the telephone currents to prevent the closing'ofsaid operating circuit, substantially as described 5. In a telephone exchange, the combination with a telephone line leading from a subscribcrs station to a central station, of a telephone set at the substation and telephonic apparatus at the-said central station to coiiperatc with said line andset for conversational purposes, alarm signal transmit- -ting'apparatus at an outlying point adapted rents prevents the actuation of the same, substantially as described. a

' (3. In a telephone exchange, the combina- 'tion with a telephone line leading. from a subscribefis station to a central station, ofa 5 telephone set at the substation and telephonic said receiver is actuated, and when both v phonic'apparatus at the said-centitalstation.

tion of the other relay by the telephone curv energized alone to actuate said receiver and i apparatus at the said central station to cotional nirposes, alarm signal transmitting apparatus at an outlying point adapted to transmit distinctive signaling currents over apparatus at the central station including a relay in each side of the line, and an operating-circuit coptrolled by said relays, one of 3 said relays wien energized serving to close said circuit. and the other to open said circuit, substantially as described.

.. ,thmughoiie of said qrnaguetsrtjo ops a e-z receiver, and means controlledb'y' the other 7. In a common battery telephone ex-' change, the combination with a telephone line leading from subscribers stations to a central station, of telephonic apparatus including a common source of current at the said central station to cooperate with said the telephone line, alarm signal receiving line for conversational purposes, a telephone,

set at the substation adapted for use with said telephonic apparatus; and 7 common source of current, alarm signal transi n1t ting apparatus at an outlying point, alarm signal receiving apparatus atrthe central-station having a magnetin each side of the telephone line, means controlled by said trans,-

mitting apparatus for sending alarm signal-- ing' currents over one side .of the line and magnetn'heirenergized by current from said common source flowing onerftl edine during its use for telephonic purposes to prevent the:

voperation of said receiver, substantially gags v described.

set at the substation agaapted '8, In a common battery telephoiie ,eiE -change, the combination ,with a-tele p'hoi'i line leading; from afsubscribersistationto the central station, of telephonic apparatusincluding a common source of current at the said central station to'cooperatewith said line for conversational Imrposes'f atelephonfi or use wit said apparatus andeent source of current,

an alarm signal transmitting apparatus at an :outlying;.point adapted to cause a flow-of signalin current over one side of the line from said central source of current, alarm signal receiving apparatus at the central staiion having a magnet in each side of the line, the magnet in one side of the line being operated. by said alarm signaling currents and serving when so operated toactuate the receiver, and theother magnet bein in the path of current over the other si e-of the line and operated by said source when the line is used for telephonic purposes, and serving when so operated to prevent the operation of the receiver, substantially as described.

9. In a telephone exchange, th combination with a plurality of telephone lines leadin g from subscribers stations to the central .station, of telephone sets at the substations o erate with said line and set for convet sa lfor conversational purposes, alarm signal transmitting apparatus at outlying points adapted to transmit distinctive signaling currents over thetelephone lines, an electromagnet ineach side of each line at the central station, a common register or said lines, the sa d magnets ofeach' line' serving when the said signaling currents are sent over the line to close the circuit. oi said common register and when telephone signaling and talking currents arepresentfou the line to prevent; the closing of said registercircuitv from that line, substantially as described. 10. In a telephone exchange, the combina tion with a )lurality of telephone lines leading from su scribers stations to the central station, of telephone sets at the substations, and telephonic apparatus at .th'e'said central station to coiiperate with said lines and sets for conversational purposes, alarin' signal transmitting ap aratus at outlying points adapted tof-sen distinctive signaling cm; rents over tliesaid lines, ;a lariu signal r ceiving and registering apparatus at the central'stati'on coin risk? an electro-magnet in eachside of eac qtelep one' line, and-a coiuinontgregister having its operating circuit being operated by the said alar'ni signaling currents and qi pmx ai sh iflisi "'t H gnet each-nae r ssi i t en "isr'rit igi-w en so- O'fj'sllitl 10g (fifig ili-lhg subtfifluftt i'i'i 5-. v =11; w eearners change, the co bination:wiura memiieant-s cuitflielephone line leading froiW iffSllllseribe'rs station to fii qelllilfll statioin of tele- -phonicappu'ratus including alinesigual. a common battery'and a cord at tlll central. station tii' cooperate with said line for conversational purposes, a telephone set at'jthe substations adapted fo'r use with said telephonic apparatus and common battery, alarm signal transmitting apparatus at an outlying poiiit adapted to cause distinctive signaling currents to flow, from said central source 'over the telephone line without operating said line'signaH-and a visual alarm receiving apparatus at the central sen-ans responsive to said distinctive signaling currents, but becoming temporarily disabled upon the passage of telephone signaling cur rents but normally disconnected for telehone talking currents, said common battery' liaving one terminal normally grounded and havin its'other terminal normally con- 'nec with onefisideof said line, said-side being 'gr't'i ufidedzat the; signal transmitting "iiiehanisnifwhen 'the si alis bcing'trans t'r initted, substantially as escribedr. v12'. In a common battery telephone ex- In-f a. common change, the combinationwith a metallic cirt I cuil telephone line leading from a subscribers station to the central station, of telephone apparatus; including a common souree of current at the said central station, a. telephone set at the sub-station adapted for use with said telephonic apparatus-"amt common source of current, and an alarm" signal transmitting.apparatus at"-an 'outlymg pomt adapted to erase ,a flow of 'disi tinctive signaling currents over-one side of the line front said central 'SOtll'CQDf' t2llt1'clll', visual alarm signal receiving apparatus at the central stat on provided '\vi t' h""a gnet painting in each side of the line; the ivtn ling m the one side of the line only be; energtzed bysaid alarm signaling currents and 'servi ng'to actuate the visual si nal, and the other winding being int-he paih of current- 13. In fa "i mmb battery elepl tone exchan e, the eoinhinatigiiv'ith. ailpliirality of telep one lines lea'ding" from 'subscribers stat-ions to the central station, oftelephonic' .appa t iils includingfiia;commonisource. of

' purposes; telephone sets" at the iulapted for se witl currentitt tl e s a'id central "station to cooperate with s'aidines'fqr. conveisationalsubstations ratus and common source?) signal transmittiiig apparatus; .at'r-out lying po nts. visual alarm ignal receiving apparatus at, the cent station individnal to eaeh'lifi'e and having a magnet in' each sideof the line.,'nieans controlled by said transmitting apparatus for sending-alarm signalin, currents 0\"cr one side of each line from i said source through one of said magnets to operate the said' visual signal, and means controlled by the otlier magnet when energized by current from said common source flowing over the line during its use for telephonic purposes t'o'prevent the operation. of said visual signal, substantially as described.

14. In a telephoneexchange, the combinationwith a plurality of telephone lines lead ing from subscribers stations to tlie'ceiitral station, of telephone sets at the substations and telephonic apparatus including line signals and a common source of current at the central ollicc to eoiiperate with said lines for conversational purposes; alarm signal transmitting apparatus at outlying points adapted to transmit distinctive signaling currents over the telephone lines, a visual alarm signal other than the-line signal insaid visual signals and common register being responsive to the alarm signaling currents over the telephone lines but" unreing currents. substantially as described.

1.3. in a telephone exchange, the combination with a plurality ot telephone lines leading from subscribcts stations to the central station. of telephone scts'at' the tllJSlitlTl0l1S and telephonic apparatus at the central station to cooperate ivit'h said lines and sets for conversational purposes. alarm signal trans mitting apparatus at"out.lying points adapted to transmit distinctive signaling currents over the telephone lines, an alarm signal rccciving apparatus at the central station common to the plurality-of lines. individual devices responsive to signaling currents over the lines to actuate said receiver and unresponsive to the telephone signaling and talking currents to prevent the operation of said receiver by the telephonic currents, fmeans for disconnwting the ,int'lividual devices from said common receiving apparatus, and auxiliary apparatus adapted to be.con-

nee-ted with said iiulividual devices when so disconnected to-coiiperate therewith and the lines to which they belong. 16. In a telephone exchange. the combination with aplurality of telephone lines leading froin'suhscribers stations to' the central station. of telephone setsitt the substations and telephonic apparatus at.thc central staztion to ctu'iperate with said lines and sets for initting apparatus at outlying points adapted to transmit distinctive si nalmg currents with/the. lines to which such individual devices belong. snbstantiall as described.

17; To a telephone exchange. the combinaing from subscribers stations to the central and telephonic apparatus at the central station to coiiperate with said lines and sets for conversational purposes. alarm signal transmitting apparatus at outlying points adapted to transmit distinctive signaling currents over the telephone lines. alarm signal receiving apparatus at the centralstatio'ircommon to the plurality of lines, individual devices signaling currents thereover to actuate said receiver but unresponsive to the telephone tion with a plurality of telephone lines lead-.

sponsive to the telephone signaling and tttlli- -conversational purposes, alarm signal trans over the telephone lines. an alarm signal re- 7 cerving apparatus at't he central station com- -(lisconncctcd to cooperate thcren'ith and station. of telephone sets at the substations for the lines responsive to the distinctive 20 ing from so 25 mitting apparatus at outlying signaling and talking currents, a spring jack between each such individual device and the common receiver, a plug normally inserted in said jack to connect the contacts thereof together and thereby complete the circuit of the said receiver, a second connecting plug adapted to be inserted in said jack when the former plug is removed, said latter plug serving to separate the contacts of the 10 jack, and testing apparatus connected with the contact of said latter plug that connects with the contact of the said jack leading to the individual device of the line to enable the said device and corresponding line to be tested without interference with the remainder of the alarm -signaling s 'stem and apparatus, substantially as described.

18. In 'a telephone exchange, the combina-- tionwith a lurality of telephone lines leadhscribers stations to the central station, oftele'phone sets at the substations 2 jlllihfiBlQQhOlllGfflPPflMliUS at the, central eta-- tion toieooperategwith-said lines and' sets. for

conversational purposes, alarm signal transmts adapted to transmit-distinctive signa ing currents over the telephone -lines,,a'n alarm signal 'fregi'ste'r atFthe-"oentral station common to Elprality of lines, individual"devioes for,

the es-responsive-to the distinctive sig'nal} in'gcurrents thereover to actuate said regisns ive ;to the telephone sig .fiingti iq i nts to e reveng-th adapted to beoperated-in case of trouble on the connecting the said individual devicefrom the register and for connectipg'said testing-apparatus with the said device, said tcsting apparatus being also :responsive to current; on the line in case of trouble andslso responsive to the absence of currenton the line when the trouble has been removed, substantially as described.

T19. Ina telephone exchange, the combination with a lurality of'tcleplione lines leading from sn )seribers stations to the central station, of telephone sets at the substations and teltalphonic apparatus including line si 1} a common source of current at he me, a test ng apparatus, means for .d1s-- upon which there is trouble is readily located, substantially as described,

20. In a telephone exchange, the eombination with a plurality of tehphone lines leading from subscribers stations to the central station, of telephone sets at (be substations and'telel'ihonic apparatus atthe central station to cooperate with said lines and sets for conversational purposes, said apparatus including a common battery connected with said lines, alarm signal transmitting apparatus at'out-l'y-ing points adaptedto transmit phone lines, an alarm signal register at the lines, individual devices for the lines responsive to the distinctive signalin currents thercover to actuate said register but unresponsive to the telephone signaling andztalking..' currents to prevent the operation thereby of said register, said individual devices .bein operated -byjaccidcntal grounds or simi ar connectionson the lines by current from said battery, a testing device adapted to be readily connected with and disconnected from any offsaid individual devices signal associated therewith whereby when .iflows ro n;.-said" sourcethrough the said testing device and out to the line and over the accidental gro I e aa tion with a. lurality oftelephone lines leading from su scribers stations to the central station, of telephone sets at the substations .tion to cooperate with said lines and sets for conversational purposes, sa1d apparatus inratus'at outlying points adapted to transmit distinctive signalingcurrents over the telephone lines, an alarm signal register at the central station common to the plurality of lines, individual devices for the lines responsive to the distinctive signaling currents tlmrenvcl' to actuate said register but unresponsive to the telephone signaling and talking currents to prevent the operation thereby of said register, said individual devices being operated by accidental ground or similar connections on the lines by current from said source flowing through such accidental oonuections=,-.a testing device adapted to be interposed between the individual de- -vice of each line and the common register to current source connected with or included in said testing device. said relay being energized from said current source until the said ground connection isremovcd a signal in a distinctive signaling currents-over the tele-.

and having a suitable source of current and connected withlthe line in trouble current 121. In a telephoneex cbiiiige, the coinbinaand telephonic apparatus attire central eta-- cludlnga common battery connected with said lines, alarm signal transnnttmgappacentral station common to the plurality of i updtov cause the o ration of 7 electrically separate the same, a relay and a local circuit controlled both by said relay and a switchin such manner that when the relay is first energized the signal is operated and when next deenergized is again operated, substantially as described.

22. In a telephone exchange, the combination with a telephone line leading from a subscriber" station to a central station, of a telephone -cll at the substation and telephonic apparatus at the said central station to cotiperateavithsaid line and set for conversational purposes, said apparatus inclading a line signal, alarm signal transmitting apparatus on the line adapted to transmit distinctive signaling currents over the telephone line, an alarm signal receiver at the central station otherthan and separate from said line signal, electro-ma-gnetic me 'ianism in the line at the central station, said line signal and said alarm receiver being both controlled through the medium of said mechanism, substantially as described.

23. In a telephone exchange,-the combination with atelephone line leading from a "subscribers station to a central station, of a telephone set at the substation and telephonic apparatus 'at the said central station to cooperate 'withsaid line and set for con- ,yers'atmnal; purposes, saidapparatus inclutb mg a line signal,- alarm signal transmitting apparatus on the line adapted to transmit distinctive signaling currents over the telephone line, an alarm signal receiver at the central station, other than and separate from saidlinesignal, electro-magnetic mechanism in the 'line at the central st ation, ,s a d line signal and said alarm receiver being both controlled through the medium of said lllLtllanism anddissimultaneously operated, substantially as described.

24. In a telephone exchange, the comlnnation with a telephone. line leading from a. subscribers station to a central station, of a telephone set at the substation and tcle phonic apparatusat the saidcentral station to cooperate with said line and set for conversational purposes, said apparatus including a line signal transmitting apparatus on the line adapted to transmit distinctive signaling currents over the telephone line, alarm signal receiving apparatus other than and separate from said line signal at the central station -including electro nmgnetic mechanism in the line, and means for controlling said line signal also through the medium of.

said mechanism, substantially as described.

25. In a telephone exchange, the combination with a telephone line leading from a subscribers station to a central station, of a telephone setat the substation and telephonic apparatus including a line signal at the said central station to cooperate with said line and set. for conversational purposes, alarm signal transmitting apparatus line signal, vsubstantially ,as described-. v

at an outlying point adapted to transmit distinctive signaling currents over the telephone line, and alarm signal receiving apparatus other than said line signal at the cen'tralstation including an electro-magnet in each side of the line, one of said magnets serving when energized alone to actuate said receiver and both serving when simultaneously energized to actuate said line signal, subs'tantiall Y as described.

26. In a common'battery telephone exchange, the combination 'with a telephone line leading from subscribers stations tot-a central station, of telephonic apparatus including a line signal and a common source of current at the said central station to cooperate with said line foryconversational purposes, a telephone set-at the substation adapted for use with said telephonic apparatus and commonsource, of current, alarm signal transmitting apparatus at an outly signaling currents from said source; over one side of the line and through one of'said mag- ,nets to operate'the receiver,',and means con;

trolled by "both, magnets flwhen nergizedfh V 3" current from sa d common, source tl J vtr1ng over the line during its use fdreanin the 'ce tral office to prevent the operation 0 said re;-

ceiver, and to cause the operation at said n aflteleph'one xcusrtgegthe combination with a telephone hne leading from a subscribers station to'a central station, of v a telcphoneset atthe substation and'telephonic apparatus including a line signal at the said central station to cooperate with said line and set for conversational'pur"; poses, alarnrsignal transmitting apparatiis atfan outlying point adapted to transmit distinctive signaling currents over thetele} plione line, and alarm signal receiving ap paratus other than said line signal at the centralstation including an electro'-' magnet in each side of the line, one of said magnets serving when energized alone to actuate said receiver and the other serving when energized to prevent the operation of said receiver, and close at -one paint the circuit ,of thesaid line signal,- substantially as described.

28. In a telephone exchange, the combi nation with a telephone line leading froma ,subscribers station to a central voffice, ofj'a telephone 'set' at the substation and tele} phonic apparatus at the central station, alarm signal transmitting apparatus con; nected with the line adapted to transmit distinctive signaling currents over the tele phone line, and alarm signal receiving 'apparatus including an electromagnet in each side of the line, one of said magnets servng when energized alone to actuate said receiver and the other serving when ener- Z gized to prevent the operation of said receiver.

29. In a tele hone exchange, the coinbination with a teephone line leading from a subscribers station to a central oflice, of atelephone set at the substation and telephonic apparatus at the central station, alarm signal transmitting apparatus connected with the line'adapted-to transmit distinctive signaling current over the telephone line, and alarm signal receiving apparatus including an electromagnet in each side of the line, and an operating circuit, one of i said magnets serving when operated to close said operating circuit to actuate the said receiving apparatus, and the other magnet serving w en actuated by the telephone curl rents to prevent the closing of said operating circuit. 1

'30. In a telephone exchan e, the combination with a telephone-line 0 telephonic apparatus at 'eachend thereof adapted for transmission of voice currents and telephonic signaling currents ovcr the metallic circuit, alarm s1 al transmittin apparatus connected wit the lineadapt .to trans mit difiinctive signaling currents over one side thereof, and alarm signal receiving apparatus having a relay responsive to said distinctive signaling currents, means sepa currents in the line for rendering said alarm si nal receiving apparatus operative, and, (itier -separate means responsive to telephone signaling currnts only, for disabling said alarm signal receiving'apparatus.

32. A'combiued telephone and alarm system comprising a circuit extending. from a substation to a central station, a central source of current having a grounded terminal, telephone signal receiving means having an energizing winding included in said circuit between said grounded terminal and said substation, means under the normal control of the subscriber for causing said telephone signal receiving means to display its signal means-for holding conversation over said circuit between said stations, alarm signal receiving means associated with said circuit, means for causing said alarm signal receiving means to display its signal without causing a display of said telephone I signal.

233. A combined telephone and alarm system comprising a circuit extending from a substation to a central station, a central .-.zource of current having a grounded terminal, telephone signal receiving means having aneiiergizing winding included in said circuit between said grounded-teriuiiial'and said substation, means under the normal control of the subscriber for causing said telephone signal receiving means to display its signal, means for holding conversationover-said circuit between said stations, alarm signal receiving means associated with said circuit, means for causing said alarm receiving means to display itssignal in response to the grounding of said circuit at a point'outside of the central station, whereby a false display-of the telephone signal is prevented.

34. A combined telephone and alarm system comprising a circuit-extending from a substation to a central station, telephonesignal transmitting and receiving means associated with said circuit, means for holding conversation'over said circuit between said :StillllOliS, alarm signal transmitting and re ceiving means for indicating an alarm withoutcausing the operation of said telephone signal receiving means and means associated with said alarm receivingnieans for indicating a ground on said circuit.

35. A; combined telephoneand alarm systern comprising a circuit extending from a substation to a central station, a'central source of current having a grounded terminal, telephone signal receivin means having an energizing winding included in said circuit between said grounded terminal and said substation,- incans under tlie'iiornial control of the sul'iscriber for causing said telephone signal receivin inea'ns'to display its signal, means for hoh ing conversation over said circuit between said stat-ions, alarm signal receiving means associated with said circuit, means for causing said alarm signal receiving means to display its signal without causing a display of said-telephone signal, and means associated with said alarm receiving iiieansfor indicating a ground on said circuit. v v

36'. A combined telephone and alarm system including a telcphone'fline, a telephone signal therefor, a pair of alarm signal relays serially connected one to each limb of said line, a local circuit. controlled by said relays, means for operating said relays when the line is in use for telephone purposes to maintain said local circuit in its normal electrical condition, an alarm receiving device conti'ollcd by said local circuit, and an alarm sending device serving, when operated, to operate 'one ofsaid relays and maintain the other in its normal condition Whereby the normal condition of said local circuit is changed and said al'arln receiving device is actuated.

37. A combined telephone and alarm systen) including a telephone line, a pair of alarm-relays seriallyconnected one to each limb of said line, a local circuit controlled bysaid relays and in a definite electrical condition when both of said relays are energized, means for simultaneously energi'lzing said relays, switch contacts controlled by said relays holding said local circuit-in said definite electrical condition when both relays are energized, means for actuating one of said relays to alter the electrical condi tion of said local circuit, and a receiving device actuated in response to the altered electrical condition of said local circuit.

Signed by me at Chicago, county of (look, State of Illinois, this 27th day of April, 190?.

, WILLIAM \V. DEAN. \Vitnesses:

,Ronnn'r Lewis A nns,

E. A. GARLOCK. 

